Yikes! An asteroid the size of a city block will pass Earth at a distance of 126,000 miles.

A fast-moving asteroid the size of a city block will give Earth a close shave on Tuesday, zooming safely past at 6:05 p.m. EDT at a distance of about 126,000 miles. That's about half the distance from the Earth to the moon and the closest approach the asteroid will have made in nearly 300 years, EarthSky.org reported.